var a = 30;
while (a >= 21 ){
	console.log(a)
	a -= 1
}
	console.log(a)

var b = 70;
while (b >= 50)
{
	console.log(b)
	b -= 5
};

var c= 1,d;
while(c <= 100){
	d = c%2;
	if (d === 0)
	{
		console.log(c)
	}
   c +=1
}
var x = 1 ,z = 0 
  while (x<=100){
	  x++;
	if (x%2===0&&x!=0){
		z +=x
	}
  }
  console.log(y);